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Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…
... dec bc ;6T
ld a,b ;4T
or c ;4T
jr ... contention
ld a,81h
ld i,a
im 2
Spectrum Screen RAM layoutHi there The spectrum screen layout is rather odd. It seems to be arranged into 3 256 byte groups. If I have an x (horizontal) coordinate (from…
... ; Screen print coords in C,B on entry
; Address ... AND $E0
LD L,A
LD A,B
AND $18 ...
OR $40
LD H,A
LD ... D,0
LD E,C
...Text scroller and custom fontYesterday I was testing this text scroll routine taken from Jonathan Cauldwell's Intro Maker (labels have been inserted to allow partial code relocab…
... ;letter times 8
LD B,A
AND 003 ; ... LD D,A ; this value is the high byte
LD A,B ...
LD C,A
LD B,008
L_35459: LD A,(DE)
AND C
Help! I'm learning Machine Code...Having decided to take the plunge and learn to machine code a while ago, I have started in earnest using the much recommended 'Mastering Machine Code…
... /> [code]
LD (#5CB0), SP
LD B, #01
loop:
LD A, B
PUSH ... a little.
[code]
LD (5CB0), SP
LD A, 1
loop ...Help! I'm learning Machine Code...Having decided to take the plunge and learn to machine code a while ago, I have started in earnest using the much recommended 'Mastering Machine Code…
... [code] LD (#5CB0), SP
LD B, #01
loop:
LD A, B
LD SP, (#5CB0)
RET
nextnumber:
INC B
JP loop ...
[/code]
50 times, it pushes a ... overwritten? The [b]top[/b] of this area ...So I did a thing...And it's nearly ready for release: [img]http://s18.postimg.org/4453ayo5j/Screen_Shot_2016_03_30_at_16_18_17.png[/img] Apologies for the enormou…
... used in expressions - LET b=a+=1 will add 1 to ... result to b
MAT INTERP a(),b() TO c(),amount interpolates ... values of two similar arrays by a ... a. Also for -=,*=,/= -and- %= (mod) ^= (power) &=,|=,~= (AND/OR/XOR)< ...The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…
... some help. :) [/b] ([i]It is a forum, not a blog.[/i]) I ... need a nice z80 disassembly library that is written in pure C ... ; store state
ld a,b ; test bc
or c ; for zero
New Game - Pietro Bros [z88dk/Nirvana+][b]PIETRO BROS[/b] Pietro and Luizo were transported to pipe world after eating some rancid mushrooms on his pizza. Help them to escape from th…
... />
ld bc,$1ffd
ld a,$04
out (c),a ; +2A/+3 ...
ld b,$7f
ld a,$10
out (c),a ; 48k rom ...CASTLE CAPERSThe Dream Fairies have been kidnapped by the evil mouse king and his horrible accolites Use your magic to make blocks or holes and go up and down t…
... /> HALT
LD C,0
IN A,(#1F)
LD B,A
AND #1F ... ; joystick not detected (C=0)
INC C
LD A,B
AND #E0 ... C ; detected new kempston joystick (C=2)
END:
LD A,C
OR A ...CASTLE CAPERSThe Dream Fairies have been kidnapped by the evil mouse king and his horrible accolites Use your magic to make blocks or holes and go up and down t…
... A,(#1F)
LD B,A
AND #1F
LD C,A
CP #1F
LD A ... )
LD A,B
AND #E0
CP #E0
LD A,C
RET ... original kempston joystick (A ignore higher bits)
LD A,B ; detected new kempston ...Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
... A
add a,a ;x2
inc a ;+1
ld b,a
ld a,c ;A,line ...Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
... A TO MEMORY ADDRESS #4000
LD A,B ;LOAD A WITH CONTENTS OF B
LD B,C ... ;LOAD B WITH CONTENTS OF C
LD C ...Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
... ld l,a ;
end_test:
ld a,b ... ;test if both counters = 00
or c ...Look whats possible in 924 bytesSo, finally after over a year of development and nearly 25 years since I first designed the graphics, I've actually made it to the point where this i…
... A TO MEMORY ADDRESS #4000
LD A,B ;LOAD A WITH CONTENTS OF B
LD B,C ... ;LOAD B WITH CONTENTS OF C
LD C ...Interupt service routinehas anyone set up a interupt service routing with pasmo? this one I tried resets the speccy EDIt- I placed the code after the END directive, I fi…
...
LD A,(HL)
XOR $40 ; toggle bright bit
LD (HL),A
Then you can just do a
[code]JR ... main code for an endless loop.
or
endless runner project..So I'm thinking of writing a small tutorial series on writing games for the speccy in C, and figured that an endless runner would be an easy example …
For people with zero experience, C/C++ can be [i]very ... , you know, invent 'a' solution/workaround for something ... high-level component. Bit of a conflict maybe. :-?
LD (#4000),HL
LD DE,(#4000)
LD A,B
LD B,C
LD C,D ...Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... the check right after a HALT instruction you should ... running this sort of loop in SpecEmu with Kempston ... /> ld b,#40
.loop
ld a,b
in a,(#1F)
inc a
jr z,.loop
Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... /> ld bc,#001f
ld l,b
ld e,b
i_00
in a,(c ... )
or e
ld ... e,a ...ZX Spectrum Z80 Development Environment on WindowsHi Folks, Just wondering what the recommendation is for a ZX Spectrum Z80 Development environment on Windows? Getting fed up with hand coding Z80…
... spectrum itself.
A lot of spectrum development is ... s say ADD A and not ADD A,A (as if you ... the (one liners) of 'LD A,B,C,D,E,F: PUSH AF ... ' and especially stuff like 'LD HL,IX' realized as 'PUSH ... assemblers used syntax like 'LD A,+0(IX)'. This is ...ZX Spectrum Z80 Development Environment on WindowsHi Folks, Just wondering what the recommendation is for a ZX Spectrum Z80 Development environment on Windows? Getting fed up with hand coding Z80…
... 's say ADD A and not ADD A,A (as if you ... along the (one liners) of 'LD A,B,C,D,E,F: PUSH AF ... sure it's a push and pop. For "LD BC,IX" I ... push/pop or is it "LD C,IXL; LD B,IXH"? Because the former ... newer assemblers used syntax like 'LD A,+0(IX)'. This is exactly ...Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…
... ld a,b
and $0F8
add a,$40
ld h,a
ld a,b ... /> add a,c
ld l,a
...The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…
... />
ld bc,$1ffd
ld a,$04
out (c),a ; +2A/+3 ...
ld b,$7f
ld a,$10
out (c),a ; 48k rom ...Summary : Fifty Pascal Programs by SybexI got around getting [url="http://www.worldofspectrum.org/infoseekid.cgi?id=2001037"]this book[/url] and have had a look through it which consists of…
... caution about using random; in a loop which doesn't contain Input ... generate the seed outside the loop and modifying my rand(num ... ); loop so maxint isn't diving ... be an A, B or C. ');
360 writeln(' First you a four-character ...printing to the screen using pokei remember there being a way to print to the screen using pokes, which would allow you to print a character anywhere in the 175x255 matrix. can anyon…
... C
JR NZ, 30140
LD A, B
SUB (IY+96)
LD B, A ... /> LD A, (23704)
ADD A, C
LD C, A
JR NC, 30171
LD A, B
SUB (IY+96)
LD B, A ...Non-repetitive RNDHi guys) Perhaps, some of you already encountered a situation, when one needed a set of [b]unique [/b](pseudo-)random values, say, from zero to 25…
My idea for a pseudorandom number is to use ... time before going around the loop again and then store the ... a=PEEK x: LET b=PEEK 23672
30 LET c=ABS (a-b): PAUSE c ...How to store and recall a "window"?I would like to memorize and then restore a rectangular portion of a screen, pixels and attributes. To make things easier, this "window" would be sit…
... /> ld b, a
sla a
sla a
ld h, a
ld a, b
ld l ... , 0
srl a
ld c, 16
l2: ld b, 8
l1: ld a, (hl)
ld ...
